Ferrothorn

Ferrothorn is a valuable defensive piece for a variety of offensive and defensive teams. While Leech Seed is its main recovery move, giving it issues with longevity, it's still a fantastic check to physical attackers such as Weavile, Melmetal, and Tyranitar. It also has good enough special bulk to take hits from Pokemon such as Tapu Koko and Tapu Lele. Its fantastic typing with many valuable resistances helps it check both physical and special attackers. One of its most valuable attributes, however, is that it is a solid Spikes setter, which is a fantastic means to support the rest of its team.